:root{--color-bg: #f7f8fa;--color-surface: #ffffff;--color-primary: #2563eb;--color-primary-hover: #1d4ed8;--color-text: #1e293b;--color-text-secondary: #64748b;--color-border: #e2e8f0;--color-user-bg: #eff6ff;--color-assistant-bg: #ffffff;--color-error-bg: #fef2f2;--color-error-text: #dc2626;--radius: 12px;--radius-sm: 8px;--shadow: 0 1px 3px rgba(0, 0, 0, .08);--max-width: 800px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans JP,sans-serif;color:var(--color-text);background:var(--color-bg);-webkit-font-smoothing:antialiased}.loading-screen,.error-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;gap:16px;color:var(--color-text-secondary)}.spinner{width:40px;height:40px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}.error-screen button{padding:8px 24px;background:var(--color-primary);color:#fff;border:none;border-radius:var(--radius-sm);cursor:pointer}.login-screen{display:flex;align-items:center;justify-content:center;height:100%;background:linear-gradient(135deg,#eff6ff,#f0fdf4)}.login-card{text-align:center;padding:48px 40px;background:var(--color-surface);border-radius:var(--radius);box-shadow:var(--shadow)}.login-card h1{font-size:1.5rem;margin-bottom:8px}.login-card p{color:var(--color-text-secondary);margin-bottom:32px;font-size:.9rem}.login-button{padding:12px 48px;font-size:1rem;font-weight:600;color:#fff;background:var(--color-primary);border:none;border-radius:var(--radius-sm);cursor:pointer;transition:background .2s}.login-button:hover{background:var(--color-primary-hover)}.chat-container{display:flex;flex-direction:column;height:100%}.chat-header{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:var(--color-surface);border-bottom:1px solid var(--color-border);box-shadow:var(--shadow)}.chat-header h1{font-size:1.1rem;font-weight:700}.logout-button{padding:6px 16px;font-size:.8rem;color:var(--color-text-secondary);background:transparent;border:1px solid var(--color-border);border-radius:var(--radius-sm);cursor:pointer;transition:all .2s}.logout-button:hover{color:var(--color-text);border-color:var(--color-text-secondary)}.chat-messages{flex:1;overflow-y:auto;padding:24px 16px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--color-text-secondary);text-align:center;gap:8px}.empty-state .hint{font-size:.85rem;opacity:.7}.message{max-width:var(--max-width);margin:0 auto 16px;padding:16px 20px;border-radius:var(--radius);box-shadow:var(--shadow)}.message-user{background:var(--color-user-bg)}.message-assistant{background:var(--color-assistant-bg)}.message-error{background:var(--color-error-bg)}.message-label{font-size:.75rem;font-weight:700;text-transform:uppercase;color:var(--color-text-secondary);margin-bottom:8px}.message-content{font-size:.95rem;line-height:1.7}.message-content p{margin-bottom:8px}.message-content p:last-child{margin-bottom:0}.message-content pre{background:#1e293b;color:#e2e8f0;padding:16px;border-radius:var(--radius-sm);overflow-x:auto;margin:12px 0;font-size:.85rem}.message-content code{background:#f1f5f9;padding:2px 6px;border-radius:4px;font-size:.85em}.message-content pre code{background:none;padding:0}.message-content a{color:var(--color-primary);text-decoration:none}.message-content a:hover{text-decoration:underline}.message-content ul,.message-content ol{padding-left:24px;margin:8px 0}.message-content li{margin-bottom:4px}.error-text{color:var(--color-error-text)}.thinking-steps{display:flex;flex-direction:column;gap:10px;padding:4px 0}.thinking-step{display:flex;align-items:center;gap:10px;font-size:.9rem;animation:fadeSlideIn .3s ease-out}.thinking-step.done{color:var(--color-text-secondary)}.thinking-step.done .step-indicator{color:#22c55e}.thinking-step.active{color:var(--color-text);font-weight:500}.step-indicator{display:flex;align-items:center;justify-content:center;width:20px;height:20px;flex-shrink:0}.step-spinner{width:14px;height:14px;border:2px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}.step-text{line-height:1.4}@keyframes fadeSlideIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}@keyframes spin{to{transform:rotate(360deg)}}.chat-input-area{padding:16px;background:var(--color-surface);border-top:1px solid var(--color-border)}.input-wrapper{display:flex;align-items:flex-end;gap:12px;max-width:var(--max-width);margin:0 auto;background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius);padding:8px 12px;transition:border-color .2s}.input-wrapper:focus-within{border-color:var(--color-primary)}.input-wrapper textarea{flex:1;resize:none;border:none;outline:none;background:transparent;font-family:inherit;font-size:.95rem;line-height:1.5;color:var(--color-text);max-height:200px}.input-wrapper textarea::placeholder{color:var(--color-text-secondary)}.send-button{display:flex;align-items:center;justify-content:center;width:36px;height:36px;flex-shrink:0;border:none;border-radius:50%;background:var(--color-primary);color:#fff;cursor:pointer;transition:background .2s}.send-button:hover:not(:disabled){background:var(--color-primary-hover)}.send-button:disabled{opacity:.4;cursor:not-allowed}.header-actions{display:flex;align-items:center;gap:8px}.settings-toggle{display:flex;align-items:center;justify-content:center;width:34px;height:34px;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:transparent;color:var(--color-text-secondary);cursor:pointer;transition:all .2s}.settings-toggle:hover{color:var(--color-text);border-color:var(--color-text-secondary)}.settings-panel{display:flex;gap:16px;padding:12px 24px;background:var(--color-bg);border-bottom:1px solid var(--color-border);flex-wrap:wrap}.setting-group{display:flex;align-items:center;gap:8px}.setting-group label{font-size:.8rem;font-weight:600;color:var(--color-text-secondary);white-space:nowrap}.setting-group select{padding:6px 28px 6px 10px;font-size:.8rem;font-family:inherit;color:var(--color-text);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-sm);cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='%2364748b'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 8px center;transition:border-color .2s}.setting-group select:focus{outline:none;border-color:var(--color-primary)}.setting-group select:disabled{opacity:.5;cursor:not-allowed}